<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>后盾人</title>
  </head>
  <body></body>
  <script>
    for (let i = 1; i <= 3; i++) {
      setTimeout(function() {
        console.log(i);
      }, 1000);
    }
    // console.log(i);
  </script>
</html>
